well it's his art style. a lot of mangaka's have the same character designs, it's being consistent. the Kishimoto brothers have similar character designs for all the mangas they've done.
i remember the animated series of this, or atleast the episode where i first saw Daisy, i was in love with her at first sight. she was strong and pretty, but its strange that a kid could feel love for a character let alone a person, since sex is still entirely alien at that point.